I think the descriptors of "mild" or "severe" are insufficient to describe the various way you can be on the spectrum. After all that is why it is a "spectrum". If you could just classify it as "mild" to "severe" it would merely be a scale. The word "spectrum" is not very precise or descriptive but to me it carries the idea of something more multidimensional which maps quite well to the variety of autistic conditions.
On the other hand, when I read for example Gunilla Gerland's autobiography A real person, it seems obvious that what I have in comparison is indeed "mild". I am not speaking of functioning level here, simply her perception of the world differs much more from neurotypicals than mine.
The main problem I think is that most non-autistic people assume that high functioning = mild. I believe you can have be severely autistic but still manage to be high functioning (with extreme adaptation efforts) and that some people with milder forms can still experience very disabling problems. Having autistic traits is one thing. Being able to adapt to the nt world is something else.
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ouroboros
A bit obsessed with vocabulary, semantics and using the right words. Sorry if it is a concern. It's the way I think, I am not hair-splitting or attacking you.